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<p>Perovskite/silicon tandem solar cells face critical stability challenges, including severe reverse-bias degradation under partial shading. Here we demonstrate that interfacial electric field discontinuity caused by the dielectric constant mismatch between the perovskite and C<sub>60</sub> layer triggers abrupt voltage breakdown and accelerates instability. This dielectric mismatch drives carrier tunnelling and interface reactions under reverse bias. To mitigate these effects, we have introduced graded dielectric layers that smooth the electric field profile, correct abnormal band bending to reduce tunnelling current and inhibit halide ion accumulation. The tandem devices achieve efficiencies of 34.18% (certified: 33.76%) and 34.03% for silicon heterojunction and tunnel oxide passivated contact architectures, respectively, and retain over 92% of their initial efficiency after 1,000 h at −15 V. A large-area multicell string reaches 31.00% efficiency and maintains over 90% of the initial value after 1,000 h of shading stress. This work advances the development of perovskite/silicon tandem solar cells under real-world conditions.</p>

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Improving the stability of monolithic perovskite/silicon tandems against reverse-bias stress using graded dielectric layers

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Lina Wang,
  • Zexin Yu,
  • Ning Wang,
  • Chunlei Zhang,
  • Francesco Vanin,
  • Arya Shenvi Kakodkar,
  • Darshit Trevadia,
  • Danpeng Gao,
  • Nikhil Kalasariya,
  • Xiting Lang,
  • Leting Xing,
  • Chuanxiao Xiao,
  • Nicola Gasparini,
  • Shuang Xiao,
  • Martin Stolterfoht,
  • Zijia Li,
  • Ruy Sebastian Bonilla,
  • Zonglong Zhu

摘要

Perovskite/silicon tandem solar cells face critical stability challenges, including severe reverse-bias degradation under partial shading. Here we demonstrate that interfacial electric field discontinuity caused by the dielectric constant mismatch between the perovskite and C60 layer triggers abrupt voltage breakdown and accelerates instability. This dielectric mismatch drives carrier tunnelling and interface reactions under reverse bias. To mitigate these effects, we have introduced graded dielectric layers that smooth the electric field profile, correct abnormal band bending to reduce tunnelling current and inhibit halide ion accumulation. The tandem devices achieve efficiencies of 34.18% (certified: 33.76%) and 34.03% for silicon heterojunction and tunnel oxide passivated contact architectures, respectively, and retain over 92% of their initial efficiency after 1,000 h at −15 V. A large-area multicell string reaches 31.00% efficiency and maintains over 90% of the initial value after 1,000 h of shading stress. This work advances the development of perovskite/silicon tandem solar cells under real-world conditions.